Which to use
“IBS” is an adjective and “ides” is a noun - they look or sound alike but fill different roles in a sentence.
- #32,851
- “IBS” frequency rank
- #44,856
- “ides” frequency rank
- 77707
- confusion score
Side-by-Side Comparison
| Feature | IBS | ides |
|---|---|---|
| Definition | Initialism of identical by state. | The notional full-moon day of a Roman month, occurring on the 15th day of the four original 31-day months (March, May, Quintilis or July, and October) and on the 13th day of all other months. |
Where the eye mixes IBS and ides
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence. IBS runs 3 letters (VCC) against ides's 4 (VCVC) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses IBS with ides
These two trip readers on the page rather than in the ear: IBS is /aɪ.biːˈɛs/ while ides is /aɪdz/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 77707, derived from the frequency rank of both members and their visual similarity.
IBS is recorded at frequency rank #32,851, classified as anadj, pronounced /aɪ.biːˈɛs/. ides is at rank #44,856, tagged as anoun, pronounced /aɪdz/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 77707, this pair ranks #26,518 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of IBS vs ides
Shared letters: is. Private to "IBS": b. Private to "ides": de.
"IBS" · 3 letters · shape VCC · "ides" · 4 letters · shape VCVC
Known mistypes of this pair
- ides ← iddes · idess · idse · ieds
Frequently Asked Questions
Do "IBS" and "ides" mean the same thing in a sentence?
In ordinary English text, does "IBS" or "ides" show up more?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "IBS" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ides" - compare definitions side by side with the headword page. Word entry
- This pair ranks #26,518 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "IBS" and "ides" also get mixed up with nearby pairs, the highest-scored neighbour is "ices vs ides". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #26,518 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.